List of top Chemistry Questions asked in JEE Main

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

The incorrect statements among the following is:

The heat of formation of $ \text{SO}_2(g) $ is given by: \[ S(g) + \frac{3}{2} O_2(g) \rightarrow SO_3(g) + 2x \, \text{kcal} \] \[ SO_2(g) + \frac{1}{2} O_2(g) \rightarrow SO_3(g) + y \, \text{kcal} \]

Match the LIST-I with LIST-II (Redox Reactions).

Choose the correct answer from the options given below:

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidizing capacity.

$\mathrm{KMnO}_{4}$ acts as an oxidising agent in acidic medium. ' X ' is the difference between the oxidation states of Mn in reactant and product. ' Y ' is the number of ' d ' electrons present in the brown red precipitate formed at the end of the acetate ion test with neutral ferric chloride. The value of $\mathrm{X}+\mathrm{Y}$ is _______ .

Given below are two statements:

Statement (I): The first ionization energy of Pb is greater than that of Sn.
Statement (II): The first ionization energy of Ge is greater than that of Si.

In light of the above statements, choose the correct answer from the options given below:

Which of the following oxidation reactions are carried out by both $ K_2Cr_2O_7 $ and $ KMnO_4 $ in acidic medium?
A. $ I^- \rightarrow I_2 $
B. $ S^{2-} \rightarrow S $
C. $ Fe^{2+} \rightarrow Fe^{3+} $
D. $ I^- \rightarrow IO_3^- $
E. $ S_2O_3^{2-} \rightarrow SO_4^{2-} $
Choose the correct answer from the options given below:

The heat of formation of $ \text{SO}_2(g) $ is given by: $$ S(g) + \frac{3}{2} O_2(g) \rightarrow SO_3(g) + 2x \, \text{kcal} $$ $$ SO_2(g) + \frac{1}{2} O_2(g) \rightarrow SO_3(g) + y \, \text{kcal} $$

Identify A, B, and C in the given reaction sequence: \[ \text{A} \xrightarrow{\text{HNO}_3} \text{Pb(NO}_3)_2 \xrightarrow{\text{H}_2\text{SO}_4} \text{B} \rightarrow \text{C (Yellow ppt)}. \]

For a reaction, $$ {N}_2{O}_5(g) \rightarrow 2{NO}_2(g) + \frac{1}{2} {O}_2(g) $$ in a constant volume container, no products were present initially. The final pressure of the system when 50% of the reaction gets completed is:

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is ___________%. [Given: Molar mass in g mol$^{-1}$ of Ag = 108, Cl = 35.5]

The species which does not undergo disproportionation reaction is:

Given below are two statements: Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
Statement (II): The boiling points of alcohols and phenols are higher in comparison to other classes of compounds such as ethers and haloalkanes. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements.

In the light of the above statements, choose the correct answer from the options given below:

Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is:

Identify correct statements:
(A) Primary amines do not give diazonium salts when treated with ${NaNO}_2$ in acidic condition.
(B) Aliphatic and aromatic primary amines on heating with ${CHCl}_3$ and ethanolic ${KOH}$ form carbylamines.
(C) Secondary and tertiary amines also give carbylamine test.
(D) Benzenesulfonyl chloride is known as Hinsberg’s reagent.
(E) Tertiary amines react with benzenesulfonyl chloride very easily.
Choose the correct answer from the options given below:

Consider an elementary reaction: \[ A(g) + B(g) \rightarrow C(g) + D(g) \] If the volume of the reaction mixture is suddenly reduced to $ \frac{1}{3} $ of its initial volume, the reaction rate will become $ x $ times of the original reaction rate. The value of $ x $ is:

Identify the inorganic sulphides that are yellow in colour:
(A) $ ({NH}_4)_2{S} $
(B) $ {PbS} $
(C) $ {CuS} $
(D) $ {As}_2{S}_3 $
(E) $ {As}_2{S}_5 $
Choose the correct answer from the options given below: